Fireflies! These silent fireworks on warm summer nights fill us with wonder. But so much about these fascinating critters remains shrouded in mystery. Our team of biologists has joined forces to sequence the genome of the Big Dipper Firefly, Photinus pyralis. This project has the potential to foster important advances in bioscience and medicine, will illuminate how a complex trait like light production evolves, and will help guide future efforts to conserve disappearing firefly populations.